the air conditioning stared working intermittent. thenit had just quit. now the defroster is on all the time & the blower does not work. the aux. fan also does not work. i can not find a hot wire to the air & heater controls. someone told me it could be a vaccum problem, but i think it is some thing electicial. i checked terminal x4 & terminal x30. where is terminal 15r. my books do not have all the brake downs. thanks barry